Sink



FIG. 1 is a top plan view of a sink showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top plan view of a second embodiment showing my new design; and

FIG. 8 is a bottom plan view of FIG. 7. 

The ornamental design for a sink, as shown and described. 